Figure 8

The residual normal quantile–quantile (Q–Q) plot for \(C_{fr} Re_{r}^{1/2}\) is presented in the upper left panel, for \(C_{{g\theta^{*} }} Re_{r}^{1/2}\) is presented in the upper right panel for \(\;Nu_{r} Re_{r}^{ - 1/2}\) is presented in the lower panel.